1.

A lens of refractive index \[n\] is put in a liquid of refractive index \[n'\] of focal length of lens in air is \[f\], its focal length in liquid will be                                                             [MP PET 1999]

A.                    \[-\frac{fn'(n-1)}{n'-n}\] 
B.                    \[-\frac{f(n'-n)}{n'(n-1)}\]
C.                    \[-\frac{n'(n-1)}{f(n'-n)}\]                                          
D.                    \[\frac{fn'\,\,n}{n-n'}\]
Answer» B.                    \[-\frac{f(n'-n)}{n'(n-1)}\]


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